Wiring analysis method for bus differential protecting CT loop in electric system
A busbar differential protection and analysis method technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of high requirements for staff, time-consuming and laborious, etc., achieve lower technical level requirements, reliable analysis results, and ensure accuracy sexual effect
Active Publication Date: 2012-08-08
西安爱邦电子系统有限公司
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Problems solved by technology
[0021] In order to solve the situation that it is time-consuming and labor-intensive to judge the wiring error of the CT circuit of the power system relay protection under manual conditions, and requires a lot of staff, the present invention provides a power system bus differential with high reliability, safe and simple use, and convenient operation. Analysis method of CT circuit wiring for dynamic protection
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Embodiment Construction
[0051] The specific process of bus differential protection CT circuit wiring analysis provided by the present invention is as follows:
[0052] 1) Obtain the parameters of each connection unit of the bus relay protection line:
[0053] Obtain the active power and reactive power transmission and reception conditions of this circuit through the measurement circuit, metering point or the associated substation, and determine the secondary correctness of the equipment unit according to the active power and reactive power transmission and reception conditions of this circuit, the effective value of the primary current, etc. The phase angle and the effective value of the current need to select a reference voltage when measuring, and the measured current phase refers to the phase of the measured current relative to the reference voltage. The reference voltage can be selected by the operator during the measurement.
[0054] 2) Measure the phase and amplitude of each phase current of e...
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The invention relates to a wiring correctness analysis method for a relay protecting CT loop in an electric system, which comprises the following steps of: 1) obtaining parameters of each connecting unit in a bus relay protecting circuit; 2) measuring the phase and the amplitude of each phase current of each connecting unit in the bus relay protecting circuit; 3) calculating and obtaining the correct current phase of the secondary loop of each connecting unit in the bus relay protecting circuit in accordance with the obtained parameters; 4) comparing and judging the correctness of the wiring of the measured bus relay protecting circuit to generate corresponding wiring status codes; 5) outputting results; and 6) performing synthesis of original and secondary edges and outputting composition results. The wiring analysis method has the advantages of high reliability, safe and simple use and convenient operation, and solves the technical problem of complicated process of manually judging wiring correctness in the prior art.
Description
technical field [0001] The invention relates to a method for analyzing the correctness of the wiring of a relay protection CT circuit in a power system, in particular to a method for analyzing and judging whether the wiring of the CT circuit of the bus differential protection in the power system is correct and whether the phase combination is correct, and giving an error Analysis methods for wiring types. Background technique [0002] For the correctness of single CT circuit wiring, it is necessary to meet the phase-to-phase difference of 120°, and the phase sequence is the same, both are positive sequence or negative sequence, and the secondary value of the current of each phase is the same. The primary current value calculated by multiplying the current effective value of the secondary measurement by the CT transformation ratio is the same as the primary current value of the measurement circuit. [0003] For bus differential protection, it is necessary to calculate the re...
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IPC IPC(8): G01R31/02
Inventor 穆明建
Owner 西安爱邦电子系统有限公司